Rev. Alban Butler (171173). Volume IV: April. The Lives of the Saints. 1866.
St. Cronan, Abbot of Roscrea, in Ireland
A MONASTERY which he founded in the county of Tipperary, in Ireland; which afterwards became a bishops see, long since united to that of Killaloe. St. Cronan died about the year 640, and was honoured as titular saint of the church of Roscrea, which was possessed of his relics. See Ushers Antiq. p. 502.